Pass mark 75% from twenty randomly chosen questions.
#1. Mean sea level density in the International Standard Atmosphere (ISA) is:
1.98 degrees Celsius per 1000 feet
14.7 grammes per square inch
29.92 inches of mercury
1225 grammes per cubic metre
#2. For smog to form:
A low pressure system is required
Freezing temeperatures are required
An inversion is normally required
High temperatures are required
#3. A METAR is a weather:
#4. What is an area of high pressure called?
A geostrophic progression
#5. Clear ice occurs when:
The airframe is cooled due to radiation at night
Small supercooled water droplets are present
The sun comes out on a snowy day
Large supercooled water droplets are present
#6. When is advection fog most likely to form?
When dry, warm air moves across a cold sea causing evaporation and consequently condensation
When warm, moist air moves across a cold land surface and is cooled below its dewpoint temperature
When warm, moist air moves across a warm sea surface and is cooled to saturation
#7. Take a look at this METAR: LMML 221530Z 18007KT -DZ BR OVC004 14/13 Q1003 – What Date and Time this report was issued?
22nd day 1530 GMT
2nd month 21st day 0530 GMT
30th day 2215 GMT
13th day 1003 GMT
#8. In the International Standard Atmosphere (ISA), the temperature lapse rate is assumed to be:
3°K per 1000 feet
1013.25 hPa per 1000 feet
1.98°C per 1000 feet
1.98°C per 1000 metres
#9. Carburettor ice is formed
Only when the OAT (outside air temperature), combined with wind-chill factor, is zero degrees C or below
By the adiabatic temperature loss of air flowing through the venturi
By the adiabatic temperature loss of air flowing through the venturi and the evaporation temperature loss coupled with high humidity
Only when the temperature is felt to be cold enough to warrant wearing a sweater or jacket, regardless of humidity levels
#10. Virga means:
Short burts of rain
Light rain that evaporates before reaching the ground
Newly formed wisps of cloud
Hail that melts and turns into rain before reaching the ground
#11. Fog that forms from the interaction of two airmasses is called:
#12. In the northern hemisphere, an aircraft flying from an area of high to low pressure will experience:
Due to the anti-clockwise motion of the airmass, and going towards the low pressure area, the wind will be from the left (port) causing a right (starboard) drift.
#13. At the passage of a warm front you would expect:
Formation of towering cumulonimbus clouds
Low stratus and poor visibility
Smooth clear conditions
#14. You’re at an airfield just a few feet above sea level, and it’s a standard day (ISA). Approximately what altitude would you find a temperature of -1 degrees Celsius?
The standard lapse rate is 2 degrees for every thousand feet. ISA standard temperature is 15 degrees at sea level.
The difference between 15 and -1 is 16 degrees. Dividing this value by 2 (two degrees per thousand feet) gives you 8. Multiply that by 1,000 and you get an altitude of 8,000 feet.
#15. On a cold, clear night, ice crystals may form on a surface directly from water vapour. What is this process called?
#16. The observed temperature at the surface is +16°C and at 4000 feet the temperature is +11°C. The state of the atmosphere can be described as:
#17. There is a natural tendency for air to flow to areas of ________ pressure from areas of ________ pressure. (Fill in the missing spaces correctly.)
High/High (in the northern hemisphere) and Low/High (in the southern hemisphere)
#18. What is the wind that forms from the result of air warming on the side of a valley called?
#19. In the ISA, what is the atmospheric pressure at sea level?
#20. For saturated air, the lapse rate is _______________ ; this is called the Saturated Adiabatic Lapse Rate (SALR)
1.5° C per 1000 feet
3° C per 1000 metres
3° F per 1000 feet
3° C per 1000 feet
1.5° C per 1000 metres